diff --git a/common/script/content/mystery-sets.js b/common/script/content/mystery-sets.js
index 14fedcfca5..a430d6f24e 100644
--- a/common/script/content/mystery-sets.js
+++ b/common/script/content/mystery-sets.js
@@ -90,6 +90,10 @@ let mysterySets = {
     start: '2015-11-25',
     end: '2015-12-02',
   },
+  201512: {
+    start: '2015-12-23',
+    end: '2016-01-02',
+  },
   301404: {
     start: '3014-03-24',
     end: '3014-04-02',